diff --git a/f/loom.c b/f/loom.c
index 91349d61b..86c94cfd5 100644
--- a/f/loom.c
+++ b/f/loom.c
@@ -1195,7 +1195,7 @@ _mur_fmix(c3_w h_w)
 /* u2_mur_words(): MurmurHash3 on raw words.
 */
 c3_w
-u2_mur_words(c3_w* key_w, c3_w len_w, c3_w syd_w)
+u2_mur_words(c3_w syd_w, c3_w len_w, c3_w* key_w)
 {
   c3_w goc_w = syd_w;
   c3_w lig_w = 0xcc9e2d51;
@@ -1219,6 +1219,22 @@ u2_mur_words(c3_w* key_w, c3_w len_w, c3_w syd_w)
   return goc_w;
 }
 
+/* u2_muz_words(): 31-bit nonzero MurmurHash3 on raw words.
+*/
+c3_w
+u2_muz_words(c3_w len_w, c3_w* key_w)
+{
+  c3_w syd_w = 0xcafebabe;
+
+  while ( 1 ) {
+    c3_w haz_w = u2_mur_words(syd_w, len_w, key_w);
+    c3_w ham_w = (haz_w >> 31) ^ (haz_w & 0x7fffffff);
+
+    if ( 0 != ham_w ) return ham_w;
+    else syd_w++;
+  }
+}
+
 /* u2_mug():
 **
 **   Compute and/or recall the mug (31-bit FNV1a hash) of (a).
@@ -1400,6 +1416,34 @@ _mug_words_buf(c3_w off_w, c3_w nwd_w, u2_noun veb)
   }
 }
 
+/* u2_mum(): MurmurHash3 on a noun.
+*/
+c3_w
+u2_mum(u2_noun veb)
+{
+  if ( u2_fly_is_cat(veb) ) {
+    return u2_muz_words((0 == veb) ? 0 : 1, &veb);
+  }
+  else {
+    if ( u2_dog_is_pom(veb) ) {
+      c3_w ham_w = u2_mum(u2h(veb)) ^ (0x7fffffff ^ u2_mum(u2t(veb)));
+ 
+      return u2_muz_words((0 == ham_w) ? 0 : 1, &ham_w);
+    }
+    else {
+      c3_w  len_w = u2_met(5, veb);
+      c3_w* buf_w = malloc(4 * len_w);
+      c3_w  ham_w;
+
+      u2_words(0, len_w, buf_w, veb);
+      ham_w = u2_muz_words(len_w, buf_w);
+
+      free(buf_w);
+      return ham_w;
+    }
+  }
+}
+
 c3_w
 u2_mug(u2_noun veb)
 {
@@ -1471,6 +1515,7 @@ u2_mug_cell(u2_noun hed,
   return u2_mug_both(lus_w, biq_w);
 }
 
+
 /* u2_mug_trel():
 **
 **   Compute the mug of `[a b c]`.
diff --git a/gen164/3/mur.c b/gen164/3/mur.c
index 02a0e6260..a2caa9e6d 100644
--- a/gen164/3/mur.c
+++ b/gen164/3/mur.c
@@ -8,20 +8,44 @@
 /* functions
 */
   u2_weak                                                         //  transfer
-  j2_mbc(Pt3, mur)(u2_wire wir_r,
-                   u2_atom key,                                   //  retain
-                   u2_atom syd)                                   //  retain
+  j2_mb(Pt3, mum)(u2_wire wir_r,
+                  u2_noun cor)                                    //  retain
+  {
+    u2_noun sam;
+
+    if ( u2_none == (sam = u2_frag(u2_cv_sam, cor)) ) {
+      return u2_bl_bail(wir_r, c3__exit);
+    } else {
+      return u2_mum(sam);
+    }
+  }
+
+/* structures
+*/
+  u2_ho_jet
+  j2_mbj(Pt3, mum)[] = {
+    { ".2", c3__lite, j2_mb(Pt3, mum), 
+      u2_jet_test | u2_jet_live, u2_none, u2_none },
+    { }
+  };
+
+
+/* functions
+*/
+  u2_weak                                                         //  transfer
+  j2_mbc(Pt3, mur)(u2_wire wir_r,
+                   u2_atom syd,                                   //  retain
+                   u2_atom key)                                   //  retain
   {
-    c3_w len_w = u2_cr_met(5, key);
     c3_w syd_w = u2_cr_word(0, syd);
+    c3_w len_w = u2_cr_met(5, key);
     {
       c3_w* key_w = alloca(4 * len_w);
       c3_w  goc_w;
 
       u2_cr_words(0, len_w, key_w, key);
-      goc_w = u2_mur_words(key_w, len_w, syd_w);
+      goc_w = u2_mur_words(syd_w, len_w, key_w);
 
-      fprintf(stderr, "goc_w %x\r\n", goc_w);
       return u2_ci_words(1, &goc_w);
     }
   }
diff --git a/gen164/watt.c b/gen164/watt.c
index 7ee06ca8d..408ea136c 100644
--- a/gen164/watt.c
+++ b/gen164/watt.c
@@ -63,6 +63,7 @@
     extern u2_ho_jet j2_mbj(Pt3, met)[];
     extern u2_ho_jet j2_mbj(Pt3, mix)[];
     extern u2_ho_jet j2_mbj(Pt3, mug)[];
+    extern u2_ho_jet j2_mbj(Pt3, mum)[];
     extern u2_ho_jet j2_mbj(Pt3, mur)[];
     extern u2_ho_jet j2_mbj(Pt3, peg)[];
     extern u2_ho_jet j2_mbj(Pt3, rap)[];
@@ -212,6 +213,7 @@
     { j2_sb(Pt3, met), j2_mbj(Pt3, met), 0, 0, u2_none },
     { j2_sb(Pt3, mix), j2_mbj(Pt3, mix), 0, 0, u2_none },
     { j2_sb(Pt3, mug), j2_mbj(Pt3, mug), 0, 0, u2_none },
+    { j2_sb(Pt3, mum), j2_mbj(Pt3, mum), 0, 0, u2_none },
     { j2_sb(Pt3, mur), j2_mbj(Pt3, mur), 0, 0, u2_none },
     { j2_sb(Pt3, peg), j2_mbj(Pt3, peg), 0, 0, u2_none },
     { j2_sb(Pt3, rap), j2_mbj(Pt3, rap), 0, 0, u2_none },
diff --git a/include/f/loom.h b/include/f/loom.h
index 7cc2e7451..22b82f176 100644
--- a/include/f/loom.h
+++ b/include/f/loom.h
@@ -555,10 +555,17 @@
           c3_w
           u2_mug(u2_noun a);
 
+        /* u2_mug():
+        **
+        **   Compute and/or recall the mug (31-bit hash) of (a).
+        */
+          c3_w
+          u2_mum(u2_noun a);
+
         /* u2_mur_words(): MurmurHash3 on raw words.
         */
           c3_w
-          u2_mur_words(c3_w* key_w, c3_w len_w, c3_w syd_w);
+          u2_mur_words(c3_w syd_w, c3_w len_w, c3_w* key_w);
 
         /* u2_mug_string():
         **